Brake Piston(s): Temperature Range -40°C to 200°C

Component Specifications

Definition

A cylindrical hydraulic piston housed within a brake caliper bore that converts hydraulic pressure from the master cylinder into mechanical force, pushing brake pads against the rotor to create friction and slow or stop a vehicle. It operates within a sealed system with dust boots and seals to prevent contamination.

Working Principle

Uses Pascal's law: hydraulic pressure from brake fluid is transmitted equally in all directions, forcing the piston outward to press brake pads against the rotor, converting kinetic energy into thermal energy through friction.

Materials

Typically aluminum alloy (A356-T6) for lightweight corrosion resistance, or phenolic resin for thermal insulation; seals made of EPDM or HNBR rubber; optional ceramic coatings for high-performance applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stroke	2-10 mm
Diameter	30-60 mm
Surface Finish	Ra 0.4-0.8 μm
Temperature Range	-40°C to 200°C
Operating Pressure	10-20 MPa

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 6310, DIN 74254, SAE J431

Parent Products

This component is used in the following industrial products

Brake Caliper/Pads

Hydraulic clamping device and friction material that converts kinetic energy to thermal energy to slow or stop vehicle motion.

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Engineering Analysis

Risks & Mitigation

Hydraulic fluid leakage leading to brake failure
Piston seizure due to corrosion or contamination
Overheating causing seal degradation
Improper installation causing misalignment

FMEA Triads

Trigger: Seal wear or damage
Failure: Fluid leakage and pressure loss
Mitigation: Regular inspection and use of high-temperature resistant seals

Trigger: Corrosion from road salt or moisture
Failure: Piston sticking or binding
Mitigation: Apply protective coatings and ensure proper dust boot integrity

Trigger: Contamination with debris
Failure: Scored piston surface and seal damage
Mitigation: Clean caliper bore during service and use quality brake fluid

Industrial Ecosystem

Compatible With

Disc brake calipers in passenger vehicles, motorcycles, and commercial trucks

Typical Suppliers & Equivalents

Brembo, Bosch, ACDelco, TRW, ATE

Compliance & Inspection

Tolerance

Diameter tolerance ±0.02 mm, surface roughness ≤0.8 μm

Test Method

Pressure testing per ISO 6310, leak test at 20 MPa, endurance cycling at operational temperatures

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Brake Piston(s)

Manufacturer profiles associated with Brake Piston(s).

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Related Components

Synchronizers

Synchronizers are precision components in manual transmissions that enable smooth gear shifting by equalizing rotational speeds between gears and shafts.

Brake Disc (Rotor)

A rotating disc in disc brake systems that creates friction with brake pads to slow or stop vehicle motion.

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Surround

Structural component that encloses and protects suspension system elements while providing mounting points and structural integrity.

Frequently Asked Questions

What causes brake piston failure?

Common causes include seal degradation from heat or age, corrosion from moisture ingress, and contamination leading to sticking or leakage.

How often should brake pistons be inspected?

Inspect during every brake pad replacement (typically every 40,000-70,000 km) for wear, corrosion, and smooth operation.

Can brake pistons be reused after repair?

Yes, if cleaned, inspected for damage, and fitted with new seals; severely corroded or scored pistons must be replaced.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Brake Piston(s)